bindings: Remove support for WebIDL arrays.

WebIDL arrays (e.g. "T[] bar") were removed from the spec back in 2015 with
whatwg/webidl#52. Previous users should use
sequences or FrozenArrays most of the time.

Now that all existing WebIDL array users have been fixed, we can finally
adapt to the change and remove support for arrays from //tools/idl_parser as
well as the bindings layer and related tests.

Bug: 740865
Change-Id: I9edfcb7b88963ea92836f7ed93945ad7edd48603
Reviewed-on: https://chromium-review.googlesource.com/616661
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Raphael Kubo da Costa (rakuco) <raphael.kubo.da.costa@intel.com>
Cr-Commit-Position: refs/heads/master@{#495108}

third_party/WebKit/LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt

@@ -1,4 +1,4 @@
-CONSOLE WARNING: line 230: 'window.webkitStorageInfo' is deprecated. Please use 'navigator.webkitTemporaryStorage' or 'navigator.webkitPersistentStorage' instead.
+CONSOLE WARNING: line 226: 'window.webkitStorageInfo' is deprecated. Please use 'navigator.webkitTemporaryStorage' or 'navigator.webkitPersistentStorage' instead.
 IDL dictionary unittest
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
@@ -22,7 +22,6 @@ PASS dict.stringSequenceOrNullMember is null
 PASS dict.elementMember is undefined.
 PASS dict.elementOrNullMember is null
 PASS dict.enumMember is undefined.
-PASS dict.enumArrayMember is undefined.
 PASS dict.enumMemberWithDefault is "foo"
 PASS dict.enumOrNullMember is null
 PASS dict.objectMember is undefined.
@@ -73,7 +72,6 @@ PASS dict.elementOrNullMember is null
 PASS dict.enumMember is "foo"
 PASS dict.enumMemberWithDefault is "bar"
 PASS dict.enumOrNullMember is "baz"
-PASS dict.enumArrayMember is ["foo", "bar", "baz"]
 PASS dict.objectMember is testObject1
 PASS dict.objectOrNullMemberWithDefault is testObject2
 PASS dict.doubleOrStringMember is 3.14
@@ -110,7 +108,6 @@ Test for setting invalid USVString value
 PASS dict.usvStringMember is "_�_�_��_"
 Test for setting invalid enum value
 PASS dictionaryTest.set({enumMember: 'invalid'}) threw exception TypeError: Failed to execute 'set' on 'DictionaryTest': The provided value 'invalid' is not a valid enum value of type InternalEnum..
-PASS dictionaryTest.set({enumArrayMember: ['foo', 'invalid', 'baz']}) threw exception TypeError: Failed to execute 'set' on 'DictionaryTest': The provided value 'invalid' is not a valid enum value of type InternalEnum..
 
 Test for setting invalid object value
 PASS dictionaryTest.set({objectMember: 42}) threw exception TypeError: Failed to execute 'set' on 'DictionaryTest': member objectMember is not an object..

third_party/WebKit/LayoutTests/fast/dom/idl-dictionary-unittest.html

@@ -29,7 +29,6 @@
     shouldBeUndefined('dict.elementMember');
     shouldBeNull('dict.elementOrNullMember');
     shouldBeUndefined('dict.enumMember');
-    shouldBeUndefined('dict.enumArrayMember');
     shouldBeEqualToString('dict.enumMemberWithDefault', 'foo');
     shouldBeNull('dict.enumOrNullMember');
     shouldBeUndefined('dict.objectMember');
@@ -87,7 +86,6 @@
         enumMember: 'foo',
         enumMemberWithDefault: 'bar',
         enumOrNullMember: 'baz',
-        enumArrayMember: ['foo', 'bar', 'baz'],
         objectMember: testObject1,
         objectOrNullMemberWithDefault: testObject2,
         doubleOrStringMember: 3.14,
@@ -116,7 +114,6 @@
     shouldBeEqualToString('dict.enumMember', 'foo');
     shouldBeEqualToString('dict.enumMemberWithDefault', 'bar');
     shouldBeEqualToString('dict.enumOrNullMember', 'baz');
-    shouldBe('dict.enumArrayMember', '["foo", "bar", "baz"]');
     shouldBe('dict.objectMember', 'testObject1');
     shouldBe('dict.objectOrNullMemberWithDefault', 'testObject2');
     shouldBe('dict.doubleOrStringMember', '3.14');
@@ -195,7 +192,6 @@
 
     debug('Test for setting invalid enum value');
     shouldThrow("dictionaryTest.set({enumMember: 'invalid'})");
-    shouldThrow("dictionaryTest.set({enumArrayMember: ['foo', 'invalid', 'baz']})");
     debug('');
 
     debug('Test for setting invalid object value');

third_party/WebKit/LayoutTests/fast/dom/idl-union-type-unittest-expected.txt

@@ -4,14 +4,14 @@ On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE
 
 
 Tests for attributes
-PASS unionTypesTest.doubleOrStringOrStringArrayAttribute is 0
-PASS unionTypesTest.doubleOrStringOrStringArrayAttribute is 3.14
-PASS unionTypesTest.doubleOrStringOrStringArrayAttribute is "foo"
-PASS unionTypesTest.doubleOrStringOrStringArrayAttribute is "undefined"
-PASS unionTypesTest.doubleOrStringOrStringArrayAttribute is "null"
-PASS unionTypesTest.doubleOrStringOrStringArrayAttribute is "[object Object]"
-PASS JSON.stringify(unionTypesTest.doubleOrStringOrStringArrayAttribute) is "[]"
-PASS JSON.stringify(unionTypesTest.doubleOrStringOrStringArrayAttribute) is "[\"a\",\"3.14\"]"
+PASS unionTypesTest.doubleOrStringOrStringSequenceAttribute is 0
+PASS unionTypesTest.doubleOrStringOrStringSequenceAttribute is 3.14
+PASS unionTypesTest.doubleOrStringOrStringSequenceAttribute is "foo"
+PASS unionTypesTest.doubleOrStringOrStringSequenceAttribute is "undefined"
+PASS unionTypesTest.doubleOrStringOrStringSequenceAttribute is "null"
+PASS unionTypesTest.doubleOrStringOrStringSequenceAttribute is "[object Object]"
+PASS JSON.stringify(unionTypesTest.doubleOrStringOrStringSequenceAttribute) is "[]"
+PASS JSON.stringify(unionTypesTest.doubleOrStringOrStringSequenceAttribute) is "[\"a\",\"3.14\"]"
 
 Tests for method arguments
 PASS unionTypesTest.doubleOrStringArg(3.14) is "double is passed: 3.14"
@@ -30,14 +30,6 @@ PASS unionTypesTest.doubleOrInternalEnumArg(null) threw exception TypeError: Fai
 PASS unionTypesTest.doubleOrInternalEnumArg({}) threw exception TypeError: Failed to execute 'doubleOrInternalEnumArg' on 'UnionTypesTest': The provided value '[object Object]' is not a valid enum value of type InternalEnum..
 PASS unionTypesTest.doubleOrInternalEnumArg([]) threw exception TypeError: Failed to execute 'doubleOrInternalEnumArg' on 'UnionTypesTest': The provided value '' is not a valid enum value of type InternalEnum..
 
-PASS unionTypesTest.doubleOrStringArrayArg([]) is ""
-PASS unionTypesTest.doubleOrStringArrayArg([3.14, "foo"]) is "double: 3.14, string: foo"
-PASS unionTypesTest.doubleOrStringArrayArg([1, "foo", "bar", 2]) is "double: 1, string: foo, string: bar, double: 2"
-PASS unionTypesTest.doubleOrStringArrayArg([null, undefined, {}, []]) is "string: null, string: undefined, string: [object Object], string: "
-PASS unionTypesTest.doubleOrStringArrayArg(null) threw exception TypeError: Failed to execute 'doubleOrStringArrayArg' on 'UnionTypesTest': The provided value cannot be converted to a sequence..
-PASS unionTypesTest.doubleOrStringArrayArg(undefined) threw exception TypeError: Failed to execute 'doubleOrStringArrayArg' on 'UnionTypesTest': The provided value cannot be converted to a sequence..
-PASS unionTypesTest.doubleOrStringArrayArg({}) threw exception TypeError: Failed to execute 'doubleOrStringArrayArg' on 'UnionTypesTest': Iterator getter is not callable..
-
 PASS unionTypesTest.doubleOrStringSequenceArg([]) is ""
 PASS unionTypesTest.doubleOrStringSequenceArg([3.14, "foo"]) is "double: 3.14, string: foo"
 PASS unionTypesTest.doubleOrStringSequenceArg([1, "foo", "bar", 2]) is "double: 1, string: foo, string: bar, double: 2"
@@ -73,16 +65,7 @@ PASS unionTypesTest.nodeListOrElementArg(null) threw exception TypeError: Failed
 PASS unionTypesTest.nodeListOrElementArg(nodeList) is "nodelist is passed"
 PASS unionTypesTest.nodeListOrElementArg(element) is "element is passed"
 
-Tests for method arguments with array/sequence members
-PASS unionTypesTest.doubleOrStringOrStringArrayArg() threw exception TypeError: Failed to execute 'doubleOrStringOrStringArrayArg' on 'UnionTypesTest': 1 argument required, but only 0 present..
-PASS unionTypesTest.doubleOrStringOrStringArrayArg("abc") is "string: abc"
-PASS unionTypesTest.doubleOrStringOrStringArrayArg(3.14) is "double: 3.14"
-PASS unionTypesTest.doubleOrStringOrStringArrayArg(true) is "string: true"
-PASS unionTypesTest.doubleOrStringOrStringArrayArg(null) is "string: null"
-PASS unionTypesTest.doubleOrStringOrStringArrayArg(undefined) is "string: undefined"
-PASS unionTypesTest.doubleOrStringOrStringArrayArg([]) is "array: []"
-PASS unionTypesTest.doubleOrStringOrStringArrayArg(["a", 3.14]) is "array: [a, 3.14]"
-PASS unionTypesTest.doubleOrStringOrStringArrayArg(new Array(3)) is "array: [undefined, undefined, undefined]"
+Tests for method arguments with sequence members
 PASS unionTypesTest.doubleOrStringOrStringSequenceArg() threw exception TypeError: Failed to execute 'doubleOrStringOrStringSequenceArg' on 'UnionTypesTest': 1 argument required, but only 0 present..
 PASS unionTypesTest.doubleOrStringOrStringSequenceArg("abc") is "string: abc"
 PASS unionTypesTest.doubleOrStringOrStringSequenceArg(3.14) is "double: 3.14"
@@ -93,16 +76,7 @@ PASS unionTypesTest.doubleOrStringOrStringSequenceArg([]) is "sequence: []"
 PASS unionTypesTest.doubleOrStringOrStringSequenceArg(["a", 3.14]) is "sequence: [a, 3.14]"
 PASS unionTypesTest.doubleOrStringOrStringSequenceArg(new Array(3)) is "sequence: [undefined, undefined, undefined]"
 
-Tests for nullable method arguments with array/sequence members
-PASS unionTypesTest.doubleOrStringOrStringArrayNullableArg() threw exception TypeError: Failed to execute 'doubleOrStringOrStringArrayNullableArg' on 'UnionTypesTest': 1 argument required, but only 0 present..
-PASS unionTypesTest.doubleOrStringOrStringArrayNullableArg("abc") is "string: abc"
-PASS unionTypesTest.doubleOrStringOrStringArrayNullableArg(3.14) is "double: 3.14"
-PASS unionTypesTest.doubleOrStringOrStringArrayNullableArg(true) is "string: true"
-PASS unionTypesTest.doubleOrStringOrStringArrayNullableArg(null) is "null"
-PASS unionTypesTest.doubleOrStringOrStringArrayNullableArg(undefined) is "null"
-PASS unionTypesTest.doubleOrStringOrStringArrayNullableArg([]) is "array: []"
-PASS unionTypesTest.doubleOrStringOrStringArrayNullableArg(["a", 3.14]) is "array: [a, 3.14]"
-PASS unionTypesTest.doubleOrStringOrStringArrayNullableArg(new Array(3)) is "array: [undefined, undefined, undefined]"
+Tests for nullable method arguments with sequence members
 PASS unionTypesTest.doubleOrStringOrStringSequenceNullableArg() threw exception TypeError: Failed to execute 'doubleOrStringOrStringSequenceNullableArg' on 'UnionTypesTest': 1 argument required, but only 0 present..
 PASS unionTypesTest.doubleOrStringOrStringSequenceNullableArg("abc") is "string: abc"
 PASS unionTypesTest.doubleOrStringOrStringSequenceNullableArg(3.14) is "double: 3.14"

third_party/WebKit/LayoutTests/fast/dom/idl-union-type-unittest.html

@@ -13,21 +13,21 @@
     var unionTypesTest = internals.unionTypesTest();
 
     debug('Tests for attributes');
-    shouldBe('unionTypesTest.doubleOrStringOrStringArrayAttribute', '0');
-    unionTypesTest.doubleOrStringOrStringArrayAttribute = 3.14;
-    shouldBe('unionTypesTest.doubleOrStringOrStringArrayAttribute', '3.14');
-    unionTypesTest.doubleOrStringOrStringArrayAttribute = "foo";
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayAttribute', 'foo');
-    unionTypesTest.doubleOrStringOrStringArrayAttribute = undefined;
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayAttribute', 'undefined');
-    unionTypesTest.doubleOrStringOrStringArrayAttribute = null;
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayAttribute', 'null');
-    unionTypesTest.doubleOrStringOrStringArrayAttribute = {};
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayAttribute', '[object Object]');
-    unionTypesTest.doubleOrStringOrStringArrayAttribute = [];
-    shouldBeEqualToString('JSON.stringify(unionTypesTest.doubleOrStringOrStringArrayAttribute)', '[]');
-    unionTypesTest.doubleOrStringOrStringArrayAttribute = ['a', 3.14];
-    shouldBeEqualToString('JSON.stringify(unionTypesTest.doubleOrStringOrStringArrayAttribute)', '["a","3.14"]');
+    shouldBe('unionTypesTest.doubleOrStringOrStringSequenceAttribute', '0');
+    unionTypesTest.doubleOrStringOrStringSequenceAttribute = 3.14;
+    shouldBe('unionTypesTest.doubleOrStringOrStringSequenceAttribute', '3.14');
+    unionTypesTest.doubleOrStringOrStringSequenceAttribute = "foo";
+    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringSequenceAttribute', 'foo');
+    unionTypesTest.doubleOrStringOrStringSequenceAttribute = undefined;
+    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringSequenceAttribute', 'undefined');
+    unionTypesTest.doubleOrStringOrStringSequenceAttribute = null;
+    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringSequenceAttribute', 'null');
+    unionTypesTest.doubleOrStringOrStringSequenceAttribute = {};
+    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringSequenceAttribute', '[object Object]');
+    unionTypesTest.doubleOrStringOrStringSequenceAttribute = [];
+    shouldBeEqualToString('JSON.stringify(unionTypesTest.doubleOrStringOrStringSequenceAttribute)', '[]');
+    unionTypesTest.doubleOrStringOrStringSequenceAttribute = ['a', 3.14];
+    shouldBeEqualToString('JSON.stringify(unionTypesTest.doubleOrStringOrStringSequenceAttribute)', '["a","3.14"]');
     debug('');
 
     debug('Tests for method arguments');
@@ -55,15 +55,6 @@
     shouldThrow('unionTypesTest.doubleOrInternalEnumArg([])');
     debug('');
 
-    shouldBeEqualToString('unionTypesTest.doubleOrStringArrayArg([])', '');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringArrayArg([3.14, "foo"])', 'double: 3.14, string: foo');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringArrayArg([1, "foo", "bar", 2])', 'double: 1, string: foo, string: bar, double: 2');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringArrayArg([null, undefined, {}, []])', 'string: null, string: undefined, string: [object Object], string: ');
-    shouldThrow('unionTypesTest.doubleOrStringArrayArg(null)');
-    shouldThrow('unionTypesTest.doubleOrStringArrayArg(undefined)');
-    shouldThrow('unionTypesTest.doubleOrStringArrayArg({})');
-    debug('');
-
     shouldBeEqualToString('unionTypesTest.doubleOrStringSequenceArg([])', '');
     shouldBeEqualToString('unionTypesTest.doubleOrStringSequenceArg([3.14, "foo"])', 'double: 3.14, string: foo');
     shouldBeEqualToString('unionTypesTest.doubleOrStringSequenceArg([1, "foo", "bar", 2])', 'double: 1, string: foo, string: bar, double: 2');
@@ -103,17 +94,7 @@
     shouldBeEqualToString('unionTypesTest.nodeListOrElementArg(element)', 'element is passed');
     debug('');
 
-    debug('Tests for method arguments with array/sequence members');
-    shouldThrow('unionTypesTest.doubleOrStringOrStringArrayArg()');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayArg("abc")', 'string: abc');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayArg(3.14)', 'double: 3.14');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayArg(true)', 'string: true');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayArg(null)', 'string: null');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayArg(undefined)', 'string: undefined');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayArg([])', 'array: []');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayArg(["a", 3.14])', 'array: [a, 3.14]');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayArg(new Array(3))', 'array: [undefined, undefined, undefined]');
-
+    debug('Tests for method arguments with sequence members');
     shouldThrow('unionTypesTest.doubleOrStringOrStringSequenceArg()');
     shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringSequenceArg("abc")', 'string: abc');
     shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringSequenceArg(3.14)', 'double: 3.14');
@@ -125,17 +106,7 @@
     shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringSequenceArg(new Array(3))', 'sequence: [undefined, undefined, undefined]');
     debug('');
 
-    debug('Tests for nullable method arguments with array/sequence members');
-    shouldThrow('unionTypesTest.doubleOrStringOrStringArrayNullableArg()');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayNullableArg("abc")', 'string: abc');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayNullableArg(3.14)', 'double: 3.14');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayNullableArg(true)', 'string: true');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayNullableArg(null)', 'null');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayNullableArg(undefined)', 'null');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayNullableArg([])', 'array: []');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayNullableArg(["a", 3.14])', 'array: [a, 3.14]');
-    shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringArrayNullableArg(new Array(3))', 'array: [undefined, undefined, undefined]');
-
+    debug('Tests for nullable method arguments with sequence members');
     shouldThrow('unionTypesTest.doubleOrStringOrStringSequenceNullableArg()');
     shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringSequenceNullableArg("abc")', 'string: abc');
     shouldBeEqualToString('unionTypesTest.doubleOrStringOrStringSequenceNullableArg(3.14)', 'double: 3.14');

third_party/WebKit/Source/bindings/core/v8/BUILD.gn

@@ -37,8 +37,6 @@ bindings_core_generated_union_type_files = [
   "$bindings_core_v8_output_dir/DoubleOrScrollTimelineAutoKeyword.h",
   "$bindings_core_v8_output_dir/DoubleOrString.cpp",
   "$bindings_core_v8_output_dir/DoubleOrString.h",
-  "$bindings_core_v8_output_dir/DoubleOrStringOrStringArray.cpp",
-  "$bindings_core_v8_output_dir/DoubleOrStringOrStringArray.h",
   "$bindings_core_v8_output_dir/DoubleOrStringOrStringSequence.cpp",
   "$bindings_core_v8_output_dir/DoubleOrStringOrStringSequence.h",
   "$bindings_core_v8_output_dir/EventListenerOptionsOrBoolean.cpp",

third_party/WebKit/Source/bindings/scripts/idl_definitions.py

@@ -64,7 +64,6 @@
 
 import abc
 
-from idl_types import IdlArrayType
 from idl_types import IdlFrozenArrayType
 from idl_types import IdlNullableType
 from idl_types import IdlRecordType
@@ -932,24 +931,14 @@ def clear_constructor_attributes(extended_attributes):
 
 def type_node_to_type(node):
     children = node.GetChildren()
-    if len(children) < 1 or len(children) > 2:
-        raise ValueError('Type node expects 1 or 2 children (type + optional array []), got %s (multi-dimensional arrays are not supported).' % len(children))
+    if len(children) != 1:
+        raise ValueError('Type node expects 1 child, got %d.' % len(children))
 
     base_type = type_node_inner_to_type(children[0])
 
     if node.GetProperty('NULLABLE'):
         base_type = IdlNullableType(base_type)
 
-    if len(children) == 2:
-        array_node = children[1]
-        array_node_class = array_node.GetClass()
-        if array_node_class != 'Array':
-            raise ValueError('Expected Array node as TypeSuffix, got %s node.' % array_node_class)
-        array_type = IdlArrayType(base_type)
-        if array_node.GetProperty('NULLABLE'):
-            return IdlNullableType(array_type)
-        return array_type
-
     return base_type
 
 

third_party/WebKit/Source/bindings/scripts/idl_types.py

@@ -8,7 +8,6 @@
  IdlType
  IdlUnionType
  IdlArrayOrSequenceType
-  IdlArrayType
   IdlSequenceType
   IdlFrozenArrayType
  IdlNullableType
@@ -391,7 +390,7 @@ def idl_types(self):
 
 
 ################################################################################
-# IdlArrayOrSequenceType, IdlArrayType, IdlSequenceType, IdlFrozenArrayType
+# IdlArrayOrSequenceType, IdlSequenceType, IdlFrozenArrayType
 ################################################################################
 
 # TODO(bashi): Rename this like "IdlArrayTypeBase" or something.
@@ -418,10 +417,6 @@ def resolve_typedefs(self, typedefs):
     def is_array_or_sequence_type(self):
         return True
 
-    @property
-    def is_array_type(self):
-        return False
-
     @property
     def is_sequence_type(self):
         return False
@@ -444,22 +439,6 @@ def idl_types(self):
             yield idl_type
 
 
-class IdlArrayType(IdlArrayOrSequenceType):
-    def __init__(self, element_type):
-        super(IdlArrayType, self).__init__(element_type)
-
-    def __str__(self):
-        return '%s[]' % self.element_type
-
-    @property
-    def name(self):
-        return self.element_type.name + 'Array'
-
-    @property
-    def is_array_type(self):
-        return True
-
-
 class IdlSequenceType(IdlArrayOrSequenceType):
     def __init__(self, element_type):
         super(IdlSequenceType, self).__init__(element_type)